#include<iostream>
using namespace std;
int main()
{
	int r, h, k;
	float volume, n;
	cin >> h>> r;
	volume = r * r * 3.14 * h;
	n = 20000/ volume;
	k = (int)n;

	if (k<n)
	k++;
	printf("%d", k);
	return 0;

}

